intranasal route is one of those subjects where the details matter more than the headlines. This page pulls together the background, the mechanisms, and the practical points readers ask about most.
Last reviewed on 2026-04-23. Where a claim depends on a specific study, the study is described rather than over-claimed.
Regulatory status differs sharply between jurisdictions. In Russia the peptide is registered as a prescription nasal preparation, while agencies such as the United States Food and Drug Administration have not approved it for any indication. Products sold elsewhere are typically labeled for laboratory research only, and such labels shift responsibility for safe handling to the purchaser. Because the same name covers pharmaceutical-grade nasal drops and bulk research powder, identity and purity documentation becomes the main practical concern when comparing sources.
Semax is a synthetic seven-amino-acid peptide whose sequence extends the ACTH(4-10) fragment with a C-terminal proline-glycine-proline tripeptide. The commonly cited sequence is Met-Glu-His-Phe-Pro-Gly-Pro, giving a molecular formula near C37H51N9O10S and a molecular weight close to 813.9 g/mol. It belongs to the broader class of synthetic ACTH fragments studied for central nervous system effects rather than for adrenal steroid stimulation. In practice the material appears as a lyophilized white powder for laboratory work or as a dilute saline solution in clinical settings.
Development is attributed to researchers at the Institute of Molecular Genetics in Moscow during the early 1980s, building on earlier Soviet work with ACTH fragments. Russian regulatory approval followed for intranasal use, and the compound has remained commercially available there for decades. Most published human data originate from Russian and, later, some Eastern European clinical reports, which are not always accessible in English translation. Outside that region the material is generally handled as a research chemical rather than a licensed medicine.
Purity assessment relies mainly on reversed-phase high-performance liquid chromatography, which separates the target heptapeptide from truncated sequences, deletion analogues, and oxidised forms. Mass spectrometry, usually coupled to liquid chromatography, confirms identity through the expected molecular ion and reveals modifications such as methionine sulfoxide formation. Amino acid analysis can verify composition, and tandem mass spectrometry supports sequence confirmation. Ultraviolet detection near 254 to 280 nanometres is convenient because the phenylalanine and histidine residues absorb in that region. Nuclear magnetic resonance is rarely used for routine release testing.
Common degradation pathways include oxidation of the methionine side chain, hydrolysis of the peptide backbone, and aggregation under unfavourable pH or concentration. Stability studies typically monitor the main peak by chromatography and report total related substances as a percentage. Because no official monograph exists, acceptance criteria vary between laboratories, and reported purity values are not directly comparable across suppliers. Analysts therefore document the method, column, and detection wavelength alongside each result, and open questions remain about how much biological activity the oxidised forms retain.
Solid semax is typically supplied as a lyophilised powder that is hygroscopic and sensitive to moisture, light, and repeated temperature cycling. Long-term storage of the dry peptide is generally recommended at approximately -20 degrees Celsius, while shorter working periods may use refrigeration at 2 to 8 degrees Celsius. Vials should remain tightly closed and desiccated when brought to room temperature, because condensation can damage the material before it is weighed. Dividing a batch into aliquots is preferable to thawing one container repeatedly.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic heptapeptide (ACTH fragment analog) | Not a steroid; does not belong to the melanocortin agonist drugs by marketing category |
| Molecular formula | C37H51N9O10S (commonly cited) | Reported values vary slightly with salt and counter-ion content |
| Appearance | White to off-white lyophilized powder | A single batch may appear as a loose cake or fluffy solid |
| Solubility | Freely soluble in water and aqueous buffer | Stock solutions are usually prepared in sterile water or saline |
| Typical storage | −20 °C or below, desiccated and protected from light | Seal opened vials promptly to limit moisture uptake |
当时的短肽研究普遍关注能否穿越血脑屏障、在低剂量下产生中枢效应，Semax 属于这一路线。鼻内给药是其主要使用方式，俄语文献报道的适应症涵盖缺血性卒中、短暂性脑缺血发作、认知功能减退以及视神经病变。这些研究大多发表在当地期刊上，样本规模与终点设置同西方试验惯例存在差异，国际同行对其临床证据的强度看法不一。
各国监管态度分化明显。俄罗斯按处方药管理，部分东欧国家留有使用记录；欧盟与美国未批准其作为药物上市，市面流通品通常标注为研究用化学品。身份差异意味着标示含量、纯度与无菌性缺少统一核查。体育领域还牵涉反兴奋剂名录，跨境携带则受目的地药品法规约束。
Semax 是人工设计的七肽，序列为 Met-Glu-His-Phe-Pro-Gly-Pro，骨架取自促肾上腺皮质激素片段 ACTH(4-10)。它于二十世纪八十年代在苏联的分子遗传学研究机构内合成。设计目标是保留该片段与注意力和记忆相关的活性，同时剔除促皮质激素释放等内分泌作用。此后俄罗斯将其登记为药品并进入临床使用。
Lyophilised powder is normally kept at -20 °C in a desiccated container, with some suppliers recommending -80 °C for long-term archival storage. Repeated freeze-thaw cycles are the most common cause of avoidable loss, so aliquoting before freezing reduces variability between working sessions. Dissolved peptide is far less stable than the dry solid and is usually prepared fresh or held briefly at 4 °C. Aqueous solutions support both hydrolysis of the backbone and oxidation of the N-terminal methionine, and these two routes dominate degradation under ordinary laboratory conditions.
Identity and purity are confirmed with reversed-phase high-performance liquid chromatography, typically monitored at 214 nanometres where the peptide bond absorbs. Mass spectrometry, either electrospray or MALDI-TOF, verifies molecular mass against the theoretical value and detects truncation or adduct formation. Amino acid analysis and peptide mapping provide additional confirmation when required. The most frequently reported impurities are deletion sequences from incomplete coupling, methionine sulfoxide from oxidation, and dimeric species formed through non-covalent aggregation. Impurity profiles depend strongly on the synthesis and purification route chosen by the producer.
Semax is a synthetic heptapeptide with the sequence Met-Glu-His-Phe-Pro-Gly-Pro. It corresponds to the ACTH(4-7) fragment extended at the C-terminus by a Pro-Gly-Pro tripeptide, an addition intended to slow enzymatic breakdown. The molecular formula is C37H51N9O10S and the molecular mass is approximately 814 daltons. In the literature it is often described as an ACTH(4-10) analog, although that label reflects a naming convention as much as a precise structural relationship. The compound was developed in Russia and remains most closely associated with that research tradition.
Laboratory descriptions of the material are consistent across suppliers. It appears as a white to off-white lyophilized powder that dissolves readily in water and in polar organic solvents such as dimethyl sulfoxide. Aqueous solutions are clear and colorless at low concentrations. Because the peptide contains methionine, oxidation at the sulfur atom is a recognized degradation pathway, and handling notes usually call for protected, desiccated storage. Reported purity for research-grade lots is generally above 95 percent as measured by reversed-phase high-performance liquid chromatography.
The compound is registered in Russia as a pharmaceutical product, most commonly formulated as a nasal solution, and has been used in that setting since the 1990s. Outside that jurisdiction it is generally handled as a research chemical rather than an approved medicine. Regulatory status therefore differs sharply between countries, and material sold internationally may not correspond to the Russian pharmaceutical formulation. Documentation with commercial samples is typically limited to a certificate of analysis covering purity and identity, not clinical status or local legal classification.
Semax is normally supplied as a lyophilized powder, and that form is the most stable. Suppliers commonly recommend storage at -20 °C in a desiccated container protected from light, with short-term handling at room temperature limited to weighing and transfer. Powder that has absorbed moisture degrades faster, so vials should be warmed to ambient temperature before opening to prevent condensation on the contents. Hygroscopic behavior is typical of short hydrophilic peptides, and humidity control matters more than temperature alone for long-term retention.
Once dissolved, the peptide is considerably less stable than the solid. Aqueous solutions are usually prepared at neutral to slightly acidic pH, filtered, and divided into single-use aliquots before freezing. Repeated freeze-thaw cycles are a common cause of avoidable loss and are best prevented by never refreezing a thawed aliquot. Adsorption to plastic and glass surfaces can lower the measured concentration of dilute solutions, particularly below roughly 0.1 mg/mL. Buffer choice, salt content, and container material all influence how much peptide remains detectable after storage.
=== Pharmacological treatment === Since the early 2020s, glucagon-like peptide-1 receptor agonists (GLP-1 RAs) have become an increasingly important component of obesity treatment in Brazil. The Brazilian Health Regulatory Agency approved liraglutide for weight management in adolescents in August 2020, followed by the approval of semaglutide for expanded use in September 2023. These approvals introduced the first GLP-1 receptor agonists specifically indicated for obesity treatment in Brazil. Subsequent years saw rapid growth in the use of semaglutide and other GLP-1-based therapies, concentrated predominantly in higher-income regions. The expansion was accompanied by increasing regulatory attention regarding off-label use and counterfeit products. Brazilian clinical guidelines recommend GLP-1 receptor agonists as part of evidence-based obesity management in selected patients. A 2025 position statement issued jointly by five Brazilian medical societies reinforced the role of GLP-1 receptor agonists — including liraglutide, semaglutide, and tirzepatide - in the pharmacological management of obesity and prevention of cardiovascular complications. Internationally, semaglutide has been recognised as a significant development in obesity pharmacotherapy, with clinical trials demonstrating weight reductions of approximately 15–17% of baseline body weight in adults without type 2 diabetes.
A 2018 systematic review of progesterone and breast cancer concluded that short-term use (<5 years) of an estrogen plus progesterone is not associated with a significant increase in risk of breast cancer but that long-term use (>5 years) is associated with greater risk. The conclusions for progesterone were the same in a 2019 meta-analysis of the worldwide epidemiological evidence by the Collaborative Group on Hormonal Factors in Breast Cancer (CGHFBC). Most data on breast density changes and breast cancer risk are with oral progesterone. Data on breast safety with vaginal progesterone are scarce. The Early versus Late Intervention Trial with Estradiol (ELITE) was a randomized controlled trial of about 650 postmenopausal women who used estradiol and 45 mg/day cyclic vaginal progesterone. Incidence of breast cancer was reported as an adverse effect. The absolute incidences were 10 cases in the estradiol plus vaginal progesterone group and 8 cases in the control group. However, the study was not adequately powered for quantifying breast cancer risk.
Moscow has an extensive tram system, which opened in 1899. The newest line was constructed in 1984. Daily tram usage by Muscovites is low, making up approximately 5% of trips, because vital connections in the network have been phased out. Nevertheless, trams remain important in some districts as feeders to metro stations. Trams also provide important cross-links between metro lines—for example, between the Universitet station on the Sokolnicheskaya Line (#1 red line) and the Profsoyuznaya station on the Kaluzhsko-Rizhskaya Line (#6 orange line), and similarly between the Voykovskaya metro station and the Strogino metro station.
This enzyme belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donors with a quinone or similar compound as acceptor. The systematic name of this enzyme class is glutathione:dehydroascorbate oxidoreductase. Other names in common use include dehydroascorbic reductase, dehydroascorbic acid reductase, glutathione dehydroascorbate reductase, DHA reductase, dehydroascorbate reductase, GDOR, and glutathione:dehydroascorbic acid oxidoreductase. This enzyme participates in three metabolic pathways: ascorbate and aldarate metabolism, glutamate metabolism, and glutathione metabolism.
Ivermectin/albendazole is indicated for use in people aged five years of age or older, for the treatment of soil-transmitted helminth infections, caused by different types of intestinal parasitic worms, which are spread through soil contaminated by human feces in areas with poor sanitation. Among the worms responsible for these diseases are hookworms (Ancylostoma duodenale, Necator americanus), roundworms (Ascaris lumbricoides), whipworms (Trichuris trichiura) and a roundworm called Strongyloides stercoralis. Ivermectin/albendazole is also indicated for the treatment of microfilaraemia (the presence of worm larvae in the blood) in people with lymphatic filariasis. Lymphatic filariasis is a neglected tropical disease commonly known as elephantiasis, which impairs the lymphatic system and can lead to the abnormal enlargement of body parts, causing pain, severe disability and social stigma. Ivermectin/albendazole is indicated for the treatment of cases of lymphatic filariasis caused by Wuchereria bancrofti, a parasite which is responsible for 90% of cases worldwide.
Sources: en.wikipedia.org
resigned as corporation chairman, and was replaced by childhood friend, Roger Harvin. In March 1996, Hala Moddelmog was appointed president of Church's Chicken, making her the first female president of a fast food restaurant chain.
== Shelf-life and safety == The purpose of IMF foods is to achieve a water activity that the food can be stored safely without refrigeration. However, the food is not sterile. Staphylococcus aureus is a microorganism of concern as it can grow and produce specific enterotoxins in water activities of 0.83-0.86 under aerobic conditions. Because of this, proper handling, storage, hygiene and good manufacturing practices are necessary to prevent Staphylococcus aureus. Molds of Aspergillis and Penicillium species can grow and produce harmful mycotoxins at water activity 0.77-0.85. Salmonella and Bacillus cereus are the primary pathogens of concern with low-moisture foods and IMFs. Most illnesses associated with low-moisture foods or IMFs have been caused by Salmonella spp. To reduce the risk of bacterial growth, products are treated with a combination of low pH, addition of sugar, salt and preservatives, and a thermal process that can eliminate pathogens and extend shelf-life. In the case of yeasts and molds, chemical preservatives such as sorbates and propionates are used to inhibit their growth.
=== Legal status === Insulin icodec was approved for medical use in Canada in March 2024. In March 2024, the Committee for Medicinal Products for Human Use of the European Medicines Agency adopted a positive opinion, recommending the granting of a marketing authorization for Awiqli, for diabetes. Insulin icodec was authorized for medical use in the European Union in May 2024. In Australia, insulin icodec was approved in 2024. Insulin icodec was approved for medical use in the United States in March 2026.
=== Judges' Costumes === Episode 1: Carla Hall as Halloween Baking Bubbly (bottle of champagne), Zac Young as a spooky ballerina, Stephanie Boswell as Cereal Killer Episode 2: Carla Hall as Tough Cookie (50s rebel gal with a cookie theme), Zac Young as a Woodland Elf, Stephanie Boswell as Sasquatch Supermodel Episode 3: Carla Hall as a Vampire CEO, Zac Young as a Vegas vampire, Stephanie Boswell as a Vampire Sorority Girl Episode 4: Carla Hall as Baaaddd Bat, Zac Young as Cool Cat, Stephanie Boswell as Fierce Falcon Episode 5: Carla Hall as Halloween Devil Diva, Zac Young as Dastardly Devil, Stephanie Boswell as Devil Bride Episode 6: Carla Hall as Glamorous Octopus, Zac Young as Dr. Jekyll and Mr. Hyde, Stephanie Boswell as Pirate Captain Episode 7: Carla Hall as Miss Universe, Zac Young as Liberace's ghost, Stephanie Boswell as Queen of the Underworld
Sources: en.wikipedia.org
It is a short synthetic peptide built from seven amino acids: methionine, glutamic acid, histidine, phenylalanine and three prolines. The sequence derives from the 4-10 fragment of adrenocorticotropic hormone with an added proline-glycine-proline tail. No plant or animal extract is involved; the material is produced by solid-phase peptide synthesis.
It was developed in the Soviet Union during the early 1980s by groups at the Institute of Molecular Genetics in Moscow. Russian approval for intranasal use followed, and it has been marketed there since. Western laboratories encountered it mainly through translated literature and, later, through online research-chemical trade.
It holds a Russian registration as a prescription nasal product but has no approval from the European Medicines Agency or the United States Food and Drug Administration. Buyers outside Russia usually receive material sold strictly for laboratory research. That distinction matters because research-grade and pharmaceutical-grade products carry different documentation and testing expectations.
Dry powder is usually kept at about -20 degrees Celsius for long-term storage and at 2 to 8 degrees Celsius for short working periods. Containers should stay sealed and protected from light and moisture to limit degradation.